Dojo 1.12.4 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 632881 bytes (618.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165776 bytes (161.9k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	55864 bytes (54.6k)	local copy
gzip -9	55812 bytes (54.5k)	local copy
libdeflate -12	53162 bytes (51.9k)	local copy
7zip -mx=9 -tgzip	53139 bytes (51.9k)	local copy
zultra	53071 bytes (51.8k)	local copy
pigz -11 -n	53070 bytes (51.8k)	local copy
kzip -s0 -rn -b1	53063 bytes (51.8k)	local copy
Zopfli	52969 bytes (51.7k)	local copy
Zopfli (defluff)	52968 bytes (51.7k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.12.4.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.12.4 file, ETag caching is available and
if your browser doesn't support GZIP decompression then the uncompressed version will be sent.

Currently best Zopfli settings

You can use my super-compressed files for whatever purpose you like as long as you respect the library's original license agreement.
There are no restrictions from my side - but please avoid hot-linking if you run a high-traffic website.

These command-line settings yielded the best compression ratio so far (Linux version of zopfli-krzymod):
zopfli --i1000000 --mb8 --mls8 --bsr40 --lazy --ohh

(found October 5, 2018)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	8	--mls8
block splitting recursion	40	--bsr40
lazy matching in LZ77	yes	--lazy
optimized Huffman headers	yes	--ohh
initial random W for iterations	1	--rw1
initial random Z for iterations	2	--rz2

Even Smaller Files Thanks To Defluff

Zopfli's output can be further optimized by the defluff tool.
In this particular case, defluff saves 1 more byte (52968 bytes).

Download

Verify file integrity

After decompression, my uncompressed files are identical to the original ones:

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.4/dojo.js --location | md5sum
0b9fd25304570a8cdb4783d57055510d -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.4.min.zopfli.js.gz | md5sum
0b9fd25304570a8cdb4783d57055510d -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.4/dojo.js --location | sha1sum
362fb3364719770e0775a16d0f97c1a1584551a4 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.4.min.zopfli.js.gz | sha1sum
362fb3364719770e0775a16d0f97c1a1584551a4 -

Other Versions

Available Dojo versions at minime.stephan-brumme.com:

1.17.3, 1.17.2, 1.17.1, 1.17.0,
1.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1, 1.16.0,
1.15.6, 1.15.5, 1.15.4, 1.15.3, 1.15.2, 1.15.1, 1.15.0,
1.14.9, 1.14.8, 1.14.7, 1.14.6, 1.14.5, 1.14.4, 1.14.3, 1.14.2, 1.14.1, 1.14.0,
1.13.10, 1.13.9, 1.13.8, 1.13.7, 1.13.6, 1.13.5, 1.13.4, 1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.11, 1.12.10, 1.12.9, 1.12.8, 1.12.7, 1.12.6, 1.12.5, 1.12.4, 1.12.3, 1.12.2, 1.12.1,
1.11.13, 1.11.12, 1.11.11, 1.11.10, 1.11.9, 1.11.8, 1.11.7, 1.11.6, 1.11.5, 1.11.4, 1.11.3, 1.11.2, 1.11.1, 1.11.0,
1.10.10, 1.10.9, 1.10.8, 1.10.7, 1.10.6, 1.10.5, 1.10.4, 1.10.3, 1.10.2, 1.10.1, 1.10.0,
1.9.11, 1.9.10, 1.9.9, 1.9.8, 1.9.7, 1.9.6, 1.9.5, 1.9.4, 1.9.3, 1.9.2, 1.9.1, 1.9.0,
1.8.14, 1.8.13, 1.8.12, 1.8.11, 1.8.10, 1.8.9, 1.8.8, 1.8.7, 1.8.6, 1.8.5, 1.8.4, 1.8.3, 1.8.2, 1.8.1, 1.8.0,
1.7.12, 1.7.11, 1.7.10, 1.7.9, 1.7.8, 1.7.7, 1.7.6, 1.7.5, 1.7.4, 1.7.3, 1.7.2, 1.7.1, 1.7.0,
1.6.5, 1.6.4, 1.6.3, 1.6.2, 1.6.1, 1.6.0,
1.5.6, 1.5.5, 1.5.4, 1.5.3, 1.5.2, 1.5.1, 1.5.0,
1.4.8, 1.4.7, 1.4.6, 1.4.5, 1.4.4, 1.4.3, 1.4.2, 1.4.1, 1.4.0,
1.3.3, 1.3.2, 1.3.1, 1.3.0,
1.2.3, 1.2.2

The project site contains an overview how well these versions were compressed.
Other interesting projects are AngularJS, BackboneJS, Bootstrap, D3, Ember, jQuery, Knockout, lodash, React, Socket.IO, ThreeJS, UnderscoreJS and Vue.

Changelog

Best Zopfli parameters so far:

Size	Improvement	Parameters	Found
52969 bytes	-1 byte	zopfli --i1000000 --mls8 --bsr40 --lazy --ohh	October 5, 2018 @ 04:22
52970 bytes	-7 bytes	zopfli --i100000 --mls8 --bsr40 --lazy --ohh	October 4, 2018 @ 11:00
52977 bytes	-1 byte	zopfli --i10000 --mls8 --bsr40 --lazy --ohh	October 2, 2018 @ 16:33
52978 bytes	-1 byte	zopfli --i10000 --mls64 --bsr30 --lazy --ohh	October 2, 2018 @ 15:57
52979 bytes	-4 bytes	zopfli --i10000 --mls2 --bsr25 --lazy --ohh	October 2, 2018 @ 15:52
52983 bytes	-1 byte	zopfli --i1000 --mls8 --bsr22 --lazy --ohh	October 2, 2018 @ 12:41
52984 bytes	-1 byte	zopfli --i1000 --mls4 --bsr17 --lazy --ohh	October 2, 2018 @ 12:38
52985 bytes	-1 byte	zopfli --i1000 --mls8 --bsr19 --lazy --ohh	October 2, 2018 @ 12:33
52986 bytes	–	zopfli --i100 --mls8 --bsr22 --lazy --ohh	October 2, 2018 @ 11:00

If there are multiple parameter sets yielding the same compressed size, only the first one found is shown.

Most recent activity on March 8, 2022 @ 16:29.

Heatmaps

This Zopfli heatmap visualizes how compression changes when modifying the --bsr and --mls parameter.
Cell's contents is the best filesize achieved (in bytes, hover with mouse over cells to see number of iterations).

Good parameters are green, bad are red. The best and worst are bold as well.
The brightness of the blue background color indicates how many iterations were processed:
10,000, 100,000 or 1,000,000.

bsr \ mls	2	4	8	16	32	64	128	256	512	1024	2048	4096	8192	16384	32768
bsr \ mls	2	4	8	16	32	64	128	256	512	1024	2048	4096	8192	16384	32768
2	52982	52982	52982	52984	52985	52984	52983	52984	52985	52984	52984	52985	52996	53013	53000
4	52983	52981	52980	52984	52994	52986	52981	52981	52987	52983	52987	52992	53000	53008	52991
6	52981	52987	52980	52982	52992	52984	52992	52980	52988	52991	52987	52990	52993	52997	52992
7	53018	53018	52983	52984	52982	52985	52980	52986	52988	52984	52984	52987	52990	53000	52990
8	52984	53022	52979	52996	52996	52997	52980	52983	52988	52994	52994	52983	52994	52996	52989
9	52982	53009	52981	52981	52981	52996	52979	52980	52986	53000	52991	52989	52991	52993	52995
10	52980	53010	52980	53019	52983	52989	52982	52987	52987	52990	53004	52982	52992	52992	52998
11	52983	53015	52979	52982	52981	52984	52979	52981	52988	53001	52991	52989	52999	53005	52990
12	52981	52981	52980	53015	52980	52990	52980	52982	52988	52991	52989	52993	52991	53002	52991
13	52981	52980	52980	52982	52984	52991	52971	52981	52989	52991	52990	52984	52998	52987	52993
14	52979	52980	52979	52983	52987	52984	52979	52984	52987	52981	53003	52989	52993	53001	52990
15	52979	53015	52980	52986	52981	52982	52981	52983	52987	52991	52984	52985	52990	53003	52991
16	52984	53011	52980	52979	52982	52992	52980	52980	52988	52991	52991	52990	52998	53007	52992
17	52983	52971	52983	52981	52982	52984	52980	52988	52988	53001	52991	52991	52994	52994	52999
18	52980	53008	52984	52982	52986	52984	52979	52987	52988	52996	53003	52989	52992	52998	52992
19	52981	53011	52980	52982	52981	52990	52979	52980	52987	52990	52991	52988	52997	53002	52994
20	52982	53009	52980	52982	52982	52983	52980	52987	52988	52992	52992	52990	52995	53002	52994
21	52981	53010	52983	52982	52985	52990	52980	52983	52988	53000	52992	52985	52994	53002	52995
22	52981	53008	52971	52981	52985	52980	52979	52982	52988	52991	53008	52989	52998	52990	52991
23	52981	53012	52981	52981	52984	52983	52980	52981	52987	53002	52996	52983	52990	53003	52988
25	52979	53008	52983	52981	52982	52984	52979	52988	52987	53000	52992	52983	52993	53001	52993
30	52980	53011	52984	52981	52982	52971	52981	52982	52989	53000	52991	52989	52991	53003	52993
40	52980	53012	52969	52983	52981	52978	52981	52982	52987	52990	52996	52982	53002	53000	52999

Due to the Monte Carlo design of my search algorithm, not all parameters have reached the same number of iterations yet:

Iterations	Min. Bytes	Reduction	Coverage
100	52986 bytes	–	100%
1,000	52983 bytes	-3 bytes	100%
10,000	52977 bytes	-6 bytes	100%
100,000	52970 bytes	-7 bytes	1.74%
1,000,000	52969 bytes	-1 byte	0.29%
10,000,000	–	–	–

KZIP has far less options available for tuning/optimization. I only played around with the number of blocks (parameter -n):

Blocks	Min. Bytes	Compared To Best Zopfli	Compared To Best KZIP
(any)	53124 bytes	+155 bytes (+0.29%)	+61 bytes
1	53063 bytes	+94 bytes (+0.18%)	–
2	53075 bytes	+106 bytes (+0.20%)	+12 bytes
3	53112 bytes	+143 bytes (+0.27%)	+49 bytes
4	53125 bytes	+156 bytes (+0.29%)	+62 bytes
5	53167 bytes	+198 bytes (+0.37%)	+104 bytes
6	53210 bytes	+241 bytes (+0.45%)	+147 bytes
7	53258 bytes	+289 bytes (+0.55%)	+195 bytes
8	53262 bytes	+293 bytes (+0.55%)	+199 bytes

Non-DEFLATE Algorithms

Archivers based on completely different compression algorithms often produce superior results.
Unfortunately, browsers only support gzip compression at the moment.
However, support for Brotli is constantly growing - for example, your browser actually supports it !

Algorithm	Program	Parameters	Size	Compared To Best Zopfli
ZPAQ (Wikipedia)	zpaq	zpaq -method 69	38924 bytes	-14045 bytes (-26.52%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46475 bytes	-6494 bytes (-12.26%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47440 bytes	-5529 bytes (-10.44%)
Brotli (Wikipedia)	brotli	brotli -q 11	48867 bytes	-4102 bytes (-7.74%)
LZMA2 (Wikipedia)	xz	xz -9	49984 bytes	-2985 bytes (-5.64%)
Zstandard (Wikipedia)	zstd	zstd -19	51407 bytes	-1562 bytes (-2.95%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51585 bytes	-1384 bytes (-2.61%)

Detailled Analysis

I wrote a DEFLATE decoder in Javascript. Click the button below to start a client-side analysis of the smallest gzipped files (may take a second):

Load and Parse Data

Notes: pigz is a fast open source multi-threaded implementation of gzip written by one of the original authors of gzip.
However, when using compression level 11, pigz actually switches to the slower Zopfli algorithm and isn't multi-threaded anymore.
KrzyMOD's extensions to Zopfli offer the highest level of configuration and is therefore used for my brute-force search.
Ken Silverman wrote the closed-source KZIP compression program and Jonathon Fowler ported it to Linux.
Defluff was created by Joachim Henke; DeflOpt is a tool by Ben Jos Walbeehm.

website made by Stephan Brumme in 2015 and still improving in 2026.
all timestamps are displayed in central european time. see my changelog.
no flash, not even images or external css files - and everything squeezed into a single html file.
which was handsomely compressed before releasing it into the wild internet - obviously.

please visit my homepage and my blog, too.
email: minime (at) stephan-brumme.com

All trademarks are property of their respective owners. You know, the boring legal stuff.